It's Pits & Perils (P&P), an original, old-school game inspired by the wargames-turned-RPGs of the early 1970s.  With close to a hundred monsters and two hundred magic items to win and wield, this slim volume (just 74-pages) has everything needed to get started with simple, intuitive rules and open-ended gameplay... 
Brimming with content, this expansion to P&P has deeper pits and deadlier perils!  But take heart, for now you can be an eastern monk or mentally gifted savant.  Fighters master combat maneuvers and magicians have access to a variety of new spells, all of them sorely needed against the foes who give this book its name...
Steeped in diabolical lore, this supplement rounds out the P&P trilogy with new classes (the barbarian and corsair), spells, and terrifying monsters from the depths of Hell!  Secondary skills add flavor while spell components extend magical power - but beware equipment failure and demonic possession, for danger awaits...
This is an introductory adventure setting for P&P meant to assist new referees and grognards alike!  It includes the Town of Dunkirk and its environs, including a mysterious ruined abbey and the orc-infested highlands.  A peaceful enough place, only now a foul darkness seeks its vengeance against the townsfolk and the world beyond...